is that sacred doctrine is a science because it proceeds from
principles established by the light of a higher science, namely, the
science of God and the blessed. Hence, just as the musician accepts on
authority the principles taught him by the mathematician, so sacred
science is established on principles revealed by God.

Reply Obj. 1: The principles of any science are either in
themselves self-evident, or reducible to the conclusions of a higher
science; and such, as we have said, are the principles of sacred
doctrine.

Reply Obj. 2: Individual facts are treated of in sacred
doctrine, not because it is concerned with them principally, but they
are introduced rather both as examples to be followed in our lives (as
in moral sciences) and in order to establish the authority of those
men through whom the divine revelation, on which this sacred scripture
or doctrine is based, has come down to us.
_______________________

THIRD ARTICLE [I, Q. 1, Art. 3]

Whether Sacred Doctrine Is One Science?

Objection 1: It seems that sacred doctrine is not one science; for
according to the Philosopher (Poster. i) "that science is one which
treats only of one class of subjects." But the creator and the
creature, both of whom are treated of in sacred doctrine, cannot be
grouped together under one class of subjects. Therefore sacred
doctrine is not one science.